[whatwg/dom] Save the is="" value an element was created with (#262)

Part of fixing https://github.com/whatwg/html/issues/1298 and https://github.com/whatwg/html/issues/1360.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/262

-- Commit Summary --

  * Save the is="" value an element was created with

-- File Changes --

    M dom.bs (21)
    M dom.html (12)

-- Patch Links --

https://github.com/whatwg/dom/pull/262.patch
https://github.com/whatwg/dom/pull/262.diff

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